Question 1058736
T+M = 18; T = 18-M
T-3 = 3(M-3)
T-3 = 3M-9
18-M-3 = 3M-9
15-M = 3M-9
-4M = -24 divide both sides by -4, and remember -/- = +
M = 6
Now solve for T:
T-3 = 3*(6-3)
T-3 = 9
T = 12 
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Check:
6+12 = 18 Correct
Note: You can also solve for T:
T+M = 18; T+6 = 18; T = 12
and then check by substituting in
T-3 = 3(M-3); 12-3 = 3(6-3); 9 = 9 Correct